Load app icon in miniresolver.

Awkwardly used LoadIconTask from ResovlerActivity, but trying to
constrain change as much as possible given release timeline.

Also:
- Update paddings and font sizes per mocks
  (https://www.figma.com/file/sGebzybgbcKrK8nBiBSWc9/Intent-Picker-%26-Sendkit?node-id=1252%3A6083)

Bug: 175433480
Test: Visual inspection.
Change-Id: Id7606d358183733efdf69f5ef687dd71605e853e